An open battery is a battery with liquid electrolyte equipped with plugs allowing to fill it. Open batteries are not watertight: the liquid inside evaporates little by little, so it is necessary to check its level regularly and top it up if necessary with distilled water.
| Advantages | Disadvantages |
|---|---|
| Repairable | Maintenance required |
| Delivers current in cold temperatures ( Their CCA rating indicates the battery has sufficient power to crank an engine in very cold temperatures) | Risk of non-homogeneity of the electrolyte if little used = premature aging |
| Withstands overloads and overheating (one can add liquid if it evaporates) | Release of hydrogen and, therefore, risk of explosion if environment not ventilated |
| Low cost | Not conducive to cold, risk of electrolyte freezing |
| Strong self-discharge (10-12% per month) if not used regularly. | |
| Leaks possible if there is tilting or shaking/vibrations |
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